b
(b) When a circuit inductance only, then the current lags behind the voltage by the phase difference of \(\pi / 2\) or \(90^{\circ} .\) While in a purely capacitance circuit, the current leads the voltage by a phase angle of \(\pi / 2\) or \(90^{\circ} .\) In a purely resistive circuit current is in phase with the applied voltage.